Java 各種時間上的操作範例
分享一些在專案中用到JAVA與日期相關的操作，包括：
- 取得目前的年、月、日
- 判斷兩個日期的大小
- 計算兩個日期的差距
- 取得昨天的日期
- 取得上個月的開始與結束日
package CDIT.stanley;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Calendar;
public class dateOperation {
public static int differentDays(Date date1,Date date2){
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
int day1= cal1.get(Calendar.DAY_OF_YEAR);
int day2 = cal2.get(Calendar.DAY_OF_YEAR);
int year1 = cal1.get(Calendar.YEAR);
int year2 = cal2.get(Calendar.YEAR);
if(year1 != year2){
int timeDistance = 0 ;
for(int i = year1 ; i < year2 ; i ++){
if(i%4==0 && i%100!=0 || i%400==0){
timeDistance += 366;
}
else{
timeDistance += 365;
}
}
return timeDistance + (day2-day1) ;
}
else{
return day2-day1;
}
}
public static Date getFirstMonthDay(Calendar calendar) {
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DATE));
return calendar.getTime();
}
public static Date getLastMonthDay(Calendar calendar) {
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));
return calendar.getTime();
}
public static void main(String[] args) throws ParseException {
//取得目前的年、月、日
Calendar calendar = Calendar.getInstance();
System.out.println("今天是" + calendar.get(Calendar.YEAR) + "年" + (calendar.get(Calendar.MONTH) + 1) + "月" + calendar.get(Calendar.DAY_OF_MONTH) + "日");
System.out.println("==================================================");
//輸出：今天是2017年8月24日
//判斷兩個日期的大小
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.TAIWAN);
Date date1 = sdf.parse("2017-08-23");
Date date2 = sdf.parse("2016-09-22");
System.out.println("Date1 < Date2 : " + date1.before(date2));
System.out.println("Date1 > Date2 : " + date1.after(date2));
System.out.println("==================================================");
//輸出：Date1 < Date2 : false、Date1 > Date2 : true
//計算兩個日期的差距
System.out.println("Date1 & Date2 差距 : " + differentDays(date1 , date2) + "天");
System.out.println("==================================================");
//輸出：Date1 & Date2 差距 : 31天
//取得昨天的日期
calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -1);
String yestedayDate = sdf.format(calendar.getTime());
System.out.println("昨天是" + yestedayDate);
System.out.println("==================================================");
//輸出：昨天是2017-08-23
//取得上個月的開始與結束日
calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,-1);
String monthDayFirst = sdf.format(getFirstMonthDay(calendar));
String monthDayLast = sdf.format(getLastMonthDay(calendar));
System.out.println("上個月的第一天是" + monthDayFirst);
System.out.println("上個月的最後一天是" + monthDayLast);
System.out.println("==================================================");
//輸出：上個月的第一天是2017-07-01、上個月的最後一天是2017-07-31
}
}
We are a gaggle of volunteers and starting a new scheme in our community. Your website offered us with useful info to work on. You’ve performed a formidable process and our entire neighborhood will likely be grateful to you.
Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You definitely know what youre talking about, why waste your intelligence on just posting videos to your site when you could be giving us something enlightening to read?
Привет!
Официальная покупка диплома вуза с сокращенной программой в Москве
mans-diploms.ru/kupit-diplom-novosibirsk
Рады оказаться полезными!.
I have noticed that online education is getting common because getting your college degree online has turned into a popular alternative for many people. A huge number of people have not necessarily had an opportunity to attend a traditional college or university although seek the raised earning potential and a better job that a Bachelors Degree grants. Still other folks might have a diploma in one discipline but wish to pursue anything they now possess an interest in.
Thanks for the concepts you are giving on this website. Another thing I would like to say is the fact that getting hold of copies of your credit report in order to examine accuracy of each and every detail is one first measures you have to accomplish in credit restoration. You are looking to cleanse your credit report from detrimental details errors that spoil your credit score.
Здравствуйте!
Заказать документ о получении высшего образования можно у нас в Москве.
rushkas-diplom.ru
A further issue is really that video gaming became one of the all-time most significant forms of entertainment for people of any age. Kids enjoy video games, and also adults do, too. The particular XBox 360 has become the favorite games systems for individuals that love to have a huge variety of video games available to them, plus who like to relax and play live with other individuals all over the world. Thanks for sharing your notions.
Советы по выбору лучшей натяжной стели для вашего дома
натяжні стелі ціна натяжні стелі ціна .
продвижение в интернете http://prodvizhenie-sajtov15.ru/ .
You really make it appear really easy with your presentation however I to find this topic to be really something that I think I’d by no means understand. It seems too complicated and very vast for me. I’m looking forward in your subsequent publish, I will try to get the dangle of it!
I do love the manner in which you have presented this particular problem and it does give us a lot of fodder for thought. However, through what precisely I have experienced, I just trust as the reviews pile on that people continue to be on point and don’t start on a tirade associated with some other news of the day. Yet, thank you for this outstanding piece and though I can not really agree with the idea in totality, I value your standpoint.
I?ll right away grab your rss feed as I can’t find your email subscription link or newsletter service. Do you’ve any? Kindly let me know so that I could subscribe. Thanks.
I think other web site proprietors should take this site as an model, very clean and fantastic user genial style and design, as well as the content. You are an expert in this topic!
https://prednisonebestprice.pro/# prednisone canada pharmacy
One other thing to point out is that an online business administration diploma is designed for students to be able to without problems proceed to bachelor degree education. The Ninety credit college degree meets the other bachelor education requirements and once you earn your associate of arts in BA online, you should have access to the most up-to-date technologies in this field. Several reasons why students need to get their associate degree in business is because they may be interested in this area and want to obtain the general education necessary ahead of jumping right into a bachelor education program. Thanks alot : ) for the tips you actually provide within your blog.
propecia otc: propecia pills – order generic propecia without rx
Thanks for the helpful write-up. It is also my opinion that mesothelioma has an incredibly long latency phase, which means that the signs of the disease might not exactly emerge till 30 to 50 years after the 1st exposure to mesothelioma. Pleural mesothelioma, that’s the most common sort and affects the area about the lungs, might result in shortness of breath, torso pains, as well as a persistent cough, which may lead to coughing up our blood.
Thank you, I’ve just been searching for info approximately this topic for a long time and yours is the best I have came upon so far. But, what about the conclusion? Are you certain about the supply?
It?s really a great and useful piece of information. I am glad that you shared this helpful information with us. Please keep us up to date like this. Thank you for sharing.
I have observed that over the course of making a relationship with real estate entrepreneurs, you’ll be able to come to understand that, in each and every real estate financial transaction, a fee is paid. Ultimately, FSBO sellers really don’t “save” the commission. Rather, they struggle to earn the commission simply by doing an agent’s occupation. In this, they expend their money and time to accomplish, as best they’re able to, the obligations of an agent. Those obligations include uncovering the home by marketing, presenting the home to buyers, building a sense of buyer desperation in order to induce an offer, arranging home inspections, managing qualification assessments with the mortgage lender, supervising maintenance tasks, and facilitating the closing.
tamoxifen skin changes: nolvadex d – tamoxifen estrogen
One more issue is that video games are normally serious as the name indicated with the main focus on understanding rather than amusement. Although, it comes with an entertainment element to keep your sons or daughters engaged, each game is often designed to focus on a specific experience or curriculum, such as math or scientific discipline. Thanks for your posting.
Привет!
Официальное получение диплома техникума с упрощенным обучением в Москве
rushkadiplomik.ru
okmark your weblog and check again here regularly. I am quite sure I?ll learn lots of new stuff right here! Best of luck for the next!
very good publish, i definitely love this website, carry on it
Thank you for every other excellent article. Where else could anybody get that kind of info in such an ideal approach of writing? I have a presentation next week, and I am at the search for such info.
Appreciating the time and energy you put into your blog and in depth information you present. It’s good to come across a blog every once in a while that isn’t the same outdated rehashed material. Excellent read! I’ve bookmarked your site and I’m including your RSS feeds to my Google account.
Check out my homepage – Leslie
I appreciate, cause I found exactly what I was looking for. You have ended my 4 day long hunt! God Bless you man. Have a nice day. Bye
Good blog! I really love how it is easy on my eyes and the data are well written. I am wondering how I might be notified when a new post has been made. I’ve subscribed to your RSS feed which must do the trick! Have a nice day!